1 #ifndef __LINUX_RWLOCK_TYPES_H
2 #define __LINUX_RWLOCK_TYPES_H
3 
4 /*
5  * include/linux/rwlock_types.h - generic rwlock type definitions
6  *				  and initializers
7  *
8  * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
9  * Released under the General Public License (GPL).
10  */
11 typedef struct {
12 	arch_rwlock_t raw_lock;
13 #ifdef CONFIG_DEBUG_SPINLOCK
14 	unsigned int magic, owner_cpu;
15 	void *owner;
16 #endif
17 #ifdef CONFIG_DEBUG_LOCK_ALLOC
18 	struct lockdep_map dep_map;
19 #endif
20 } rwlock_t;
21 
22 #define RWLOCK_MAGIC		0xdeaf1eed
23 
24 #ifdef CONFIG_DEBUG_LOCK_ALLOC
25 # define RW_DEP_MAP_INIT(lockname)	.dep_map = { .name = #lockname }
26 #else
27 # define RW_DEP_MAP_INIT(lockname)
28 #endif
29 
30 #ifdef CONFIG_DEBUG_SPINLOCK
31 #define __RW_LOCK_UNLOCKED(lockname)					\
32 	(rwlock_t)	{	.raw_lock = __ARCH_RW_LOCK_UNLOCKED,	\
33 				.magic = RWLOCK_MAGIC,			\
34 				.owner = SPINLOCK_OWNER_INIT,		\
35 				.owner_cpu = -1,			\
36 				RW_DEP_MAP_INIT(lockname) }
37 #else
38 #define __RW_LOCK_UNLOCKED(lockname) \
39 	(rwlock_t)	{	.raw_lock = __ARCH_RW_LOCK_UNLOCKED,	\
40 				RW_DEP_MAP_INIT(lockname) }
41 #endif
42 
43 #define DEFINE_RWLOCK(x)	rwlock_t x = __RW_LOCK_UNLOCKED(x)
44 
45 #endif /* __LINUX_RWLOCK_TYPES_H */
46